I have it with the subgrid

Basically, you need
1 Sub-grid Row, with 1 subgrid column.
In the subgrid column are your 4 containers

with your content content

set the columns holding the subgrid to 12 spans at all breakpoints

flex as appropriate

Hi,

How can I setup an span 4 for 3 columns?

Kind regards
Stephane

What exactly do you mean by that? Three columns beside each other? Make them each 4 spans wide.

Yes three colums

IS he serious ??? he doesn't even yet know how to do that !!!!!